E (disambiguation)

E is the fifth letter of the Latin alphabet.

E or e may also refer to:

Commerce and transportation

€, the symbol for the euro, the European Union's standard currency unit
℮, the estimated sign, an EU symbol indicating that the weight or volume of the goods is within specific allowable tolerances
E, the country identifier for vehicle registration plates of Spain
E, a Polish electric locomotive in PKP classification system
E or Eni, an Italian oil and gas company
E-Mark, an approval mark for automotive products in Europe under the World Forum for Harmonization of Vehicle Regulations

E number, a number code for a food additive, an EU labelling requirement
Haplogroup E (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
Haplogroup E (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup
E or glutamic acid, an amino acid, glutamate
E. coli or Escherichia coli, a bacterium commonly found in the lower intestine; some are pathogenic, others are not
E. coli or Entamoeba coli, a non-pathogenic parasite frequently found in the human intestine
Vitamin E or Tocopherol, a class of chemical compounds
The symbol for the hormone epinephrine
Ecstasy chemical compound MDMA
Ethambutol

e (or e⁻) or electron, a fundamental subatomic particle
e or elementary charge, the absolute value of the electric charge carried by a single electron.
e or coefficient of restitution (COR), a measure of the elasticity of a collision in mechanics
E, the symbol for energy in equations concerning mass-energy equivalence
E or Young's modulus, a measure of stiffness in solid mechanics
E or exa-, the SI prefix for 10¹⁸
E-layer or the Kennelly-Heaviside layer, part of the ionosphere
E, the symbol for an electric field
e or orbital eccentricity, a measure of how much a conic section deviates from a circle
E or Equal Energy spectrum, a definition of white in colour printing
E, the electrode potential, the electromotive force of a cell built of two electrodes
- E°, the standard electrode potential

$e$ , also known as Euler's number and Napier's constant, a transcendental number and the base of natural logarithms, approximately equal to 2.718
E notation, or scientific notation, a way of writing very large and very small numbers
∃ (a backwards E; U+2203) or existential quantification, the symbol for "there exists...", in predicate logic; ∃! meaning "there exists only one" (or "there exists exactly one") - see Uniqueness quantification
E, 14 in hexadecimal and other positional numeral systems of a base of 15 or higher
$\operatorname {E} [X]$ or Expected value, the average expected outcome of a trial in probability theory
$E$ , the complete elliptic integral of the second kind
$e$ , the identity element

E (complexity), a set of decision problems solvable by a Turing machine in a specific time
E (PC DOS), a text editor
E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s
E (programming language), an object-oriented programming language
e (verification language) hardware verification language
E (theorem prover), a modern, high performance prover for first-order logic
Amiga E, a programming language
E or Enlightenment (software), a free software open source manager for X Window System
/e/ (operating system), a fork of LineageOS, which in turn is based on Android

E (musical note)
E major, a scale
E minor, a scale
E major chord, Chord names and symbols (popular music)
E, a nickname of Mark Oliver Everett, musician and front man of the rock band Eels
[e], an album from Korean hip-hop group Epik High
E (video), by Eminem
E (Adrian Belew album), 2009
E (Big Bang album)
E (Enslaved album), 2017
E, a 2019 album by Ecco2K

E!, Entertainment Television, an American cable and satellite TV network
- E! (Australia), the Australian version of American E!
E! (Canada):
- E! (Canadian TV system), a defunct over-the-air television system operated by Canwest from 2001 to 2009 (originally known as CH until 2007)
- E! (Canadian TV channel), a Canadian cable/satellite specialty channel owned by Bell Media that launched in November 2010.
E (2006 film), a 2006 Tamil film
E (2017 film)
E, or Edna Mode, a character from the movie The Incredibles
E, or Eric Murphy, a character from the television series Entourage
E, the production code for the 1964 Doctor Who serial The Keys of Marinus

E (surname) (Chinese: 鄂), Chinese surname
E, a nickname of Mark Oliver Everett, musician and front man of the rock band Eels
e, a nickname of Eric Neustadter, Operations Manager for Xbox Live and frequent co-host of the "Major Nelson Radio" podcast
Mr. E (disambiguation)

e (novel), a 2000 comic novel by Matt Beaumont
E band (disambiguation)
E#, a team's elimination number
E, slang name for the recreational drug Ecstasy, also called MDMA
E, or the Elohist, one of the four sources of the Torah
E, or Everyone, a video game rating symbol used by the Entertainment Software Rating Board (ESRB) which is suitable for all ages.
Dominical letter E for a common year starting on Wednesday
E-Z notation, to indicate double bonds that two groups of higher priority are on opposite sides.
E or EDGE, for Enhanced Data Rates for GSM Evolution
Echo, the military time zone code for UTC+05:00
"E" Is for Evidence, the fifth novel in Sue Grafton's "Alphabet mystery" series, published in 1988